class_docstr: Base class for row group indexers.
docstr: Return list of values in index
docstr_tok: ["Return","list","of","values","in","index"]
code: def indexed_values(self):
      """Return list of values in index"""
      return None
  
file_path: petastorm/petastorm/etl/__init__.py
imports: import abc
  import six
label_desc: Use image node_id 4 for calling the RowGroupIndexerBase obj's underlying member method code with example usage: obj.indexed_values() and returns: None